JPH06241162A - Swash plate type compressor - Google Patents

Abstract

PURPOSE:To restrict vibration and noise by improving the responsibility of the spring work of a thrust bearing that supports a swash plate in the thrusting direction. CONSTITUTION:The preload in the thrusting direction is given to the outer peripheral as well as inner circumferential thrust receiving surfaces S2, S4 of a pair of thrust races 12a, 12b, and 13b, 13b in the progressing direction forming thrust bearings 12, 13, to elastically deform and tilt the thrust bearings 12, 13. In this tilted condition. The revolving thrust receiving surface S1 in front of the boss part 10a of a swash plate 10, and the fixed thrust receiving surface S3 in the side of a cylinder block 1 are defined as tilted thrust receiving surfaces which are brought into contact with one another on the plane, in relation to the thrust receiving surfaces S2, S4 of the thrust races 12a, 12b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swash plate type compressor, and more particularly to an assembly structure of a thrust bearing for supporting the swash plate in the axial direction of a drive shaft.

[0002]

2. Description of the Related Art Generally, in a swash plate type compressor, a piston is reciprocally slidably housed in a cylinder bore formed in a cylinder block, as disclosed in, for example, JP-A-60-209674. Further, a swash plate is fitted and fixed on the drive shaft in a swash plate chamber formed in the cylinder block, and the piston is reciprocally moved by the rotation of the swash plate accompanying the rotation of the drive shaft to perform suction and compression operations. I have to. Further, a thrust bearing is interposed between the front and rear end surfaces of the boss portion of the swash plate and the inner wall surface of the cylinder block on the side of the swash plate chamber to receive a compression reaction force associated with the reciprocating motion of the piston. One of a pair of front and rear thrust traces forming this thrust bearing is pressed with a preload in opposite directions by the turning thrust receiving surface of the boss on the outer peripheral side and the fixed thrust receiving surface of the cylinder block on the other inner side. It is interposed in an inclined state. Therefore, the boss portion of the swash plate is elastically supported by a pair of front and rear thrust bearings so as to regulate the reciprocal movement in the front-rear direction by a predetermined preload.

[0003]

In the above swash plate type compressor, the orbiting thrust receiving surface of the boss portion for pressing the thrust bearing and the fixed thrust receiving surface of the cylinder block are planes parallel to each other. Therefore, when the thrust traces are assembled in an inclined state, the edge portions of the swivel and fixed thrust receiving surfaces locally contact the thrust receiving surfaces of the thrust traces. For this reason, the contact portion locally wears or bites, and slippage does not easily occur. Therefore, the compression reaction force acting on the swash plate via the piston during the compression operation of the refrigerant gas causes the needles between the front and rear thrust races and both races to move separately, thereby reducing the responsiveness of the spring action of the thrust bearing. . As a result, there is a problem in that the vibration of the compressor becomes large and abnormal noise is generated.

The present invention solves the problems existing in the conventional swash plate type compressor, improves the response of the spring action of the thrust bearing, suppresses the vibration of the compressor, and prevents the generation of abnormal noise. An object is to provide a swash plate type compressor that can be used.

[0005]

In order to achieve the above object, the present invention rotatably supports a drive shaft through a pair of radial bearings in a shaft hole of a cylinder block having a swash plate chamber, and the drive shaft is rotatably supported by the drive shaft. On the other hand, the boss portion of the swash plate is fitted and fixed so as to be located in the swash plate chamber, and the front and rear swivel thrust receiving surfaces formed on the boss portion and the front and rear fixed thrust receiving surfaces formed on the cylinder block. In the swash plate type compressor in which thrust bearings are respectively interposed between the swash plate compressor and the reciprocating motion of the swash plate due to the rotation of the drive shaft, reciprocating motion is imparted to the piston. Of the thrust bearing surface near the outer circumference of the bearing and the thrust bearing surface near the inner circumference of the other thrust trace When both thrust bearings are assembled, a preload in the thrust direction is applied while both thrust bearings are in contact with each other, and both thrust bearings are elastically deformed and tilted.In this tilted state, the front and rear swing thrust bearings are received. Surface and the fixed thrust receiving surface on the front and rear sides, at least the swirling or fixed thrust receiving surface near the inner circumference makes a plane contact or a curved surface thrust contact with the thrust receiving surface of the thrust race. Is an inclined surface or an arc surface.

[0006]

According to the present invention, when the swash plate is rotated by the rotation of the drive shaft and the piston reciprocates in the cylinder bore, the refrigerant gas sucked from the suction chamber into the cylinder bore is compressed and discharged into the discharge chamber. When the inside of the cylinder bore on the front side is in the compression stroke, a compression reaction force acts on the swash plate on the rear side via the piston. Due to this compression reaction force, the thrust bearing on the rear side is elastically deformed in the direction of increasing the inclination angle, the pressing force on the thrust bearing on the front side is reduced, and the inclination angle is reduced. On the contrary, when the inside of the rear cylinder bore is in the compression stroke, the compression reaction force acts on the swash plate through the piston to the front side, and the thrust bearing on the front side is elastically deformed in the direction of increasing the inclination angle, The thrust on the side thrust bearing is reduced and its tilt angle is reduced.

According to the present invention, the thrust receiving surface on the inner peripheral side of the thrust receiving surface of the thrust race makes a plane contact or a curved contact. Therefore, when the thrust bearing is elastically deformed as described above, sliding friction between the thrust receiving surfaces is reduced, wear and bite are suppressed, the response of the thrust bearing spring action is improved, and vibration and noise can be suppressed. .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment embodying the present invention will be described below with reference to FIGS.

As shown in FIG. 3, a front housing 5 and a rear housing 6 are connected to the front and rear ends of the pair of cylinder blocks 1 and 2 via valve plates 3 and 4 by a plurality of bolts B. . Further, suction chambers 5a, 6a and discharge chambers 5b, 6b are defined in the front and rear housings 5, 6, respectively. or,
A drive shaft 7 is rotatably supported in the shaft holes 1b and 2b of the cylinder blocks 1 and 2 via a pair of radial bearings 8 and 8. A swash plate chamber 9 is formed between the cylinder blocks 1 and 2, and a swash plate 10 is fitted and fixed to the drive shaft 7 at its boss portion 10a so as to be located in the swash plate chamber 9. A plurality of cylinder bores 1c and 2c are formed in the cylinder blocks 1 and 2 in parallel with the drive shaft 7, and a double-headed piston 11 is reciprocally fitted in each cylinder bore 1c and 2c. The piston 11 is moored to the swash plate 10 via a shoe.

Thrust bearings 12, 13 to be described later are interposed between both ends of the boss portion 10a of the swash plate 10 and the cylinder blocks 1, 2. Both of the suction chambers 5
a and 6a communicate with the swash plate chamber 9 via suction passages 1a and 2a, respectively. The suction chambers 5a and 6a are connected to a refrigerant gas suction pipe (not shown), and the discharge chambers 5b and 6a are
b are respectively connected to the refrigerant gas discharge pipes (not shown).

Next, the assembly structure of the thrust bearings 12 and 13 which is the main part of the present invention will be described. The thrust bearing 12 includes a pair of thrust traces 12a and 12b.
And a large number of needles 12c interposed between both races, and a retainer (not shown) that supports each needle 12c on the races 12a and 12b. The thrust bearing 13 also includes a pair of thrust traces 13a and 13b.
And a plurality of needles 13c interposed between both races and a retainer (not shown) that supports each needle 13c on the races 13a and 13b. In addition, the annular ridges 10 are provided on both front and rear wall surfaces of the boss portion 10a of the swash plate 10.
b, 10b are formed, and the thrust receiving surfaces S2, S2 near the outer periphery of the thrust traces 12a, 13a are supported by the swirl thrust receiving surfaces S1, S1 formed on the protrusions 10b, 10b. On the side wall surface of the swash plate chamber 9 of the cylinder blocks 1 and 2, annular protrusions 1d and 2d having a smaller diameter than the annular protrusion 10b are formed so as to be close to the shaft holes 1b and 2b. The thrust traces 12b, 13b are formed by the fixed thrust receiving surfaces S3, S3 formed on the annular protrusions 1d, 2d.
It supports the thrust receiving surfaces S4, S4 near the inner circumference. Further, both thrust bearings 12 and 13 are pre-loaded in the thrust direction in a state where they are assembled between the cylinder blocks 1 and 2 and the boss portion 10a, and tilt within the elastic limit. The swivel thrust receiving surface S is arranged so that the swivel thrust receiving surface S1 on the front side makes plane contact with the thrust receiving surface S2 of the race 12a when the thrust bearing 12 is inclined.
1 is an inclined surface (hereinafter referred to as an inclined thrust receiving surface S1). Similarly, the fixed thrust receiving surface S3 is also an inclined thrust receiving surface S3. Further, the turning and fixed thrust receiving surfaces S1 and S3 on the rear side are similarly inclined tilt receiving surfaces S.
1 and S3. The swiveling and fixed inclined thrust receiving surfaces S1 and S3 are inclined surfaces parallel to each other, and both receiving surfaces S1 and S3.
As shown in FIG. 2, the non-contact surface connected to 3 is the receiving surface S1, S
Makes an obtuse angle with 3.

Next, the operation of the swash plate type compressor constructed as described above will be described. Now, when the swash plate 10 is rotated by the drive shaft 7 in FIG.
Is reciprocated in the front-rear direction, and the refrigerant gas sucked into the cylinder bores 1c, 2c from the suction chambers 5a, 6a is compressed in the bores and sent under pressure to the discharge chambers 5b, 6b.

When the inside of the cylinder bore 1c on the front side is in the compression stroke, a compression reaction force acts on the swash plate 10 via the piston 11 on the rear side. Due to this compression reaction force, the thrust bearing 13 on the rear side is elastically deformed in the direction of increasing the inclination angle, the pressing force on the thrust bearing 12 on the front side is reduced, and the inclination angle is reduced. On the other hand, when the inside of the rear cylinder bore 2c is in the compression stroke, a compression reaction force acts on the swash plate 10 via the piston 11 on the front side, and the thrust bearing 12 on the front side is elastic in the direction of increasing the inclination angle. By being deformed, the pressing force on the thrust bearing 13 on the rear side is reduced, and the inclination angle thereof is reduced. In this way, both thrust bearings 12, 13
A compression reaction force that repeatedly increases or decreases the tilt angle acts on.

In this embodiment, the thrust traces 12a, 1
The inclined thrust receiving surfaces S1 and S1 are in planar contact with the thrust receiving surfaces S2 and S2 of 3b. The inclined thrust receiving surfaces S3 and S3 are in flat contact with the thrust receiving surfaces S4 and S4 of the thrust traces 12b and 13b.
Therefore, the reciprocating motion of the piston 11 causes the swash plate 10 to receive a compression reaction force in the front-rear direction, and the thrust bearings 12, 13
Thrust receiving surfaces S1, S2 and S when elastically deformed
Sliding friction between S3 and S4 is reduced. As a result, wear and bite on the sliding surface are suppressed and the thrust bearing 12,
The responsiveness of the spring action of No. 13 is improved, and vibration and noise can be suppressed by about 10% as compared with the conventional example.

Next, a second embodiment of the present invention will be described with reference to FIG. In this second embodiment,
Swash plate 10 and annular projections 10b of the cylinder block 1, 1
The shape of the thrust receiving surfaces S1 and S3 formed in d is an arc surface. Also, although not shown, the thrust receiving surface S on the rear side
Similarly, 1 and S3 are also circular arc surfaces. Therefore, when the thrust bearings 12, 13 are elastically deformed by the compression reaction force described above, the thrust receiving surfaces S1, S2 and S3, S
4 Sliding friction between them is reduced. Then, abrasion and bite on the sliding surface are suppressed, the response of the thrust bearings 12 and 13 in spring action is improved, and vibration and abnormal noise can be suppressed.

The present invention is not limited to the above embodiment, but can be embodied as follows. (1) Thrust receiving surfaces S3, S of the annular protrusions 1d, 2d
3, the outer sides of the thrust bearings 12 and 13 are supported, and the thrust receiving surfaces S1 and S1 of the annular ridges 10b and 10b are supported.
To support the inside of the thrust bearings 12 and 13.

(2) Thrust receiving surface S3 located inside
The sliding friction of S4 is due to the thrust receiving surface S1, which is located outside.
Compared with the sliding friction of S2, the contact area is small due to the size of the circumference, and therefore it becomes large. Therefore, the responsivity of the spring action of the thrust bearings 12 and 13 is improved even if only the inner thrust receiving surfaces S3 and S4 are in flat contact or curved contact.

[0018]

As described above in detail, according to the present invention, the thrust located at least on the inner peripheral side of the front and rear swivel thrust receiving surfaces of the boss portion of the swash plate and the fixed thrust receiving surface of the cylinder block side. The receiving surface was an inclined surface or an arc surface. Therefore, the sliding friction between the thrust bearing surface of the race of the thrust bearing and the swivel or fixed thrust bearing surface is reduced, wear and bite are suppressed, the response of the spring action of the thrust bearing is improved, and vibration and noise are generated. Can be suppressed.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view showing the vicinity of a thrust bearing of a swash plate type compressor according to a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part.

FIG. 3 is a vertical cross-sectional view of a central portion of a swash plate compressor.

FIG. 4 is a sectional view showing a second embodiment of the present invention.

[Explanation of symbols]

1, 2 ... Cylinder block, 1b, 2b ... Shaft hole, 1d,
2d ... Annular ridges, 5, 6 ... Front and rear housings, 7 ... Drive shaft, 9 ... Swash plate chamber, 10 Swash plate, 10a ... Boss, 10b ... Annular ridges, 11 ... Pistons, 12, 13
... Thrust bearing, 12a, 13a ... Thrust trace, S1 ... Revolving thrust receiving surface, S2, S4 ... Thrust bearing side thrust receiving surface, S3 ... Fixed thrust receiving surface.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shoji Takemoto 2-chome, Toyota-cho, Kariya city, Aichi stock company Toyota Industries Corp.

Claims (1)

[Claims] 1. A swash plate boss is rotatably supported in a shaft hole of a cylinder block having a swash plate chamber via a pair of radial bearings, and a boss portion of the swash plate is positioned relative to the drive shaft in the swash plate chamber. In addition to fitting and fixing, thrust bearings are respectively interposed between the front and rear swivel thrust receiving surfaces formed on the boss portion and the front and rear fixed thrust receiving surfaces formed on the cylinder block, and In a swash plate type compressor in which a reciprocating motion is imparted to a piston by rotation of a swash plate due to rotation, a thrust receiving surface near one outer periphery of one thrust race forming both thrust bearings and an inner periphery of another thrust trace When the swivel thrust receiving surface and the fixed thrust receiving surface are displaced in the radial direction and are in contact with the side thrust receiving surface, both thrust bearings are in contact with each other. When assembling the gears, a preload in the thrust direction is applied to elastically deform and thrust both thrust bearings, and in this tilted state, the front and rear swivel thrust receiving surfaces and the front and rear fixed thrust receiving surfaces. Of these, at least the swash plate compressor whose swivel or fixed thrust receiving surface is an inclined surface or an arc surface so that the swivel or fixed thrust receiving surface near the inner circumference makes a plane contact or a curved surface contact with the thrust receiving surface of the thrust race. .